Shimano GRX RD-RX812 Shadow+ 11 Speed Rear Derailleur - Rear Derailleur - 11 Speed - Black - Mid Cage - 42T Max Replace Images Correct use of your bicycle's

Correct use of your bicycle's gears will allow you to fine tune any training session without having to manually adjust resistance

On sandwich and hamburger models there is a new black hard density compound that is more resistant to big impacts and shares the impact to a wider area of the lower density foam

thanks to a minimal central line knobs

Preps surface for use with TLR-1

Cons: Not compatible with other brands

Shimano GRX RD-RX812 Shadow+ 11 Speed Rear Derailleur - Rear Derailleur - 11 Speed - Black - Mid Cage - 42T Max Replace Images Correct use of your bicycle'sWith an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON OFF switch for the chain tensioner. The RD RX812 rear derailleur is compatible with mtb cassettes with a 42T low sprocket max.